From: Stefan Monnier <monnier@iro.umontreal.ca>
To: emacs-devel@gnu.org
Subject: Re: widgets with dynamic-choice
Date: Tue, 19 Jul 2016 09:24:15 -0400 [thread overview]
Message-ID: <jwveg6phjrw.fsf-monnier+gmane.emacs.devel@gnu.org> (raw)
In-Reply-To: 87a8hest12.fsf@lifelogs.com
>>> * when should the widget get updated?
[ BTW, "updated" doesn't seem like the right word. Did you mean
"computed"? ]
SM> When we need to display it?
> That means potentially a long delay on display. With customization UIs
> that can be really frustrating. Can we agree on a timeout at least?
We don't have such a thing for the completion table of text-based
widgets, so I don't see why we should have that here. IOW I think it's
the responsability of the function not to take too much time.
>>> * how are errors handled? do we empty the list or go back to the last
>>> good version?
SM> I wouldn't try to be clever here either. Just let the signal percolate.
> So presumably a novice user will get a strange error that they don't
> know how to handle or report? It's a practical solution but maybe a bit
> unfriendly...
In case there's a bug in the function? Yes. Same as when there's a bug
anywhere else. I don't understand why you think this case is different.
SM> I think we should start with a dynamic version of `choice` and see from
SM> there if it can be easily generalized or not.
> OK, so this is the simple way:
>
> (defcustom myvar nil "Whatever"
> :type '(dynamic-choice myvar-dynamic-choice-function))
>
> Simple and easy to understand, but not extensible.
Right.
> Could we leave room for future extension? The following will be a bit
> friendlier if other types are supported.
>
> (defcustom myvar nil "Whatever"
> :type '(choice :dynamic myvar-dynamic-choice-function))
Yes, it would be great to allow this kind of :dynamic for
various types. But I'm not familiar enough with the code to have
a sense of how it would work out.
Stefan
next prev parent reply other threads:[~2016-07-19 13:24 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-07-18 16:53 widgets with dynamic-choice Ted Zlatanov
2016-07-18 17:26 ` Stefan Monnier
2016-07-18 18:25 ` Ted Zlatanov
2016-07-19 13:24 ` Stefan Monnier [this message]
2016-07-19 14:11 ` Ted Zlatanov
2016-07-19 14:25 ` Stefan Monnier
2016-07-26 14:42 ` Ted Zlatanov
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